[1]WEI Rong,LIU Ji,LI Shijun,et al.Characteristics of Dry and Wet Change of Climate in the Yalong River Basin During the Period 1961-2017[J].Research of Soil and Water Conservation,2020,27(02):193-199.
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Characteristics of Dry and Wet Change of Climate in the Yalong River Basin During the Period 1961-2017
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 02
Page number:
193-199
Column:
Public date:
2020-03-30
- Title:
- Characteristics of Dry and Wet Change of Climate in the Yalong River Basin During the Period 1961-2017
- CLC:
- P467
- DOI:
- -
- Abstract:
- In order to study the dry and wet conditions of the Yalong River Basin, to provide a scientific basis for the climate division and agricultural production layout in the region, based on the monthly data of 16 meteorological stations in the Yalong River Basin and its surrounding areas during the period 1961—2017, the potential evapotranspiration and dry-wet index of the study area were calculated using the FAO Penman-Monteith formula. The methods including climate tendency rate, Mann-Kendall(M-K)trend test and mutation test were used to analyze the spatial and temporal variations and spatial differences in dry and wet conditions in the Yalong River Basin. The results show that the dry-wet index of the Yalong RiverBasin slightly increased in the past 57 years with a change tendency rate of 0.002/decade; the dry-wet index showed a unimodal seasonality peaking from June to September; spatially, the dry-wet index decreased and then increased from the downstream to the upstream, the highest value was observed at Kangding and Yuexi stations in the downstream section, while the lowest was found at Ganzi and Xinlong stations in the midstream section; the M-K trend analysis suggests that the dry-wet index in the downstream of Yalong River Basin significantly decreased except Xichang station; the the dry-wet indoces of the middle and upper reaches showed a significant increaseing trend except Qingshuihe and Shiqu stations; overall, the dry-wet indices showed the significantly increasing trend over around 69.41% of the basin; according to the M-K mutation analysis, the dry-wet indices in Yalong River Basin abruptly changed from dry to wet conditions in 1977, and from wet to dry conditions in 2005; the dry-wet indices are positively correlated with average temperature, relative humidity, average wind speed and precipitation, and are negatively correlated with sunshine hours and potential evapotranspiration, the correlation coefficient between dry-wet index and relative humidity is the greatest.
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Last Update:
2020-02-25